If the slips fail to hold the tool assembly, the dog collar will prevent the entire assembly form dropping through and being lost in the wellbore.
如果卡瓦未能固定工具组合，则爪环将会防止整个工具组合落井。
If the slips fail to hold the tool assembly, the dog collar will prevent the entire assembly form dropping through and being lost in the wellbore.
如果卡瓦未能固定工具组合，则爪环将会防止整个工具组合落井。
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